CN113118214B

CN113118214B - Rolling equipment and rolling method

Info

Publication number: CN113118214B
Application number: CN202110411544.7A
Authority: CN
Inventors: 刘洪勤; 马力; 徐继玲; 李毅
Original assignee: Anhui Jinchi New Material Co ltd; Shanghai Wuxing Copper Co ltd
Current assignee: Anhui Jinchi New Material Co ltd; Shanghai Wuxing Copper Co ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2023-03-24
Anticipated expiration: 2041-04-16
Also published as: CN113118214A; WO2022217716A1

Abstract

A rolling apparatus includes a mill and a set of adjustment rolls. The rolling mill adopts a rolling scheme of unequal-diameter working rolls, so that the foil is thinned overall and better plate shape is obtained; the rolling mill adopts an asymmetric roller system, reduces the number of rollers, is favorable for improving the roller system precision and is convenient for the adjustment and maintenance of the rollers. The adjusting roller group adopts the oil blocking roller and the flattening roller with different diameters, the flattening effect and the oil blocking effect are considered, the oil blocking roller with the smaller roller diameter is favorable for squeezing redundant lubricating oil, and the flattening roller with the larger roller diameter is favorable for reducing the original defects of foil. A rolling method, through adjusting the height of the nip roll, make the foil coat and form the coating arc on the roll surface of the working roll with larger roll diameter, through the back support of the working roll to the foil, make the tension distribute evenly on the cross section of the foil; the defects are eliminated at the early stage of the key forming of rolling, and the plate shape is stabilized at the later stage of the rolling forming, so that the high-precision rolling of the wide foil is realized.

Description

Rolling equipment and rolling method

Technical Field

The invention relates to the technical field of rolling mills, in particular to rolling equipment and a rolling method, which are used for high-precision rolling of wide foils.

Background

With the progress of the science and technology industry, the market demand for high-precision wide-width foils is more urgent. In the current technical background, the rolling technology of wide and thick foils is basically mature, but still faces a lot of technical obstacles in the rolling technology of high-precision wide foils. For thicker foils, even if the plate shape defects exist after rolling, the plate shape can still be finished and corrected by straightening or other flattening means, and for foils, especially foils with extremely small thickness, the control can only be realized by depending on rolling due to the lack of subsequent plate shape correction means. Particularly, for foils with large deformation resistance such as copper, copper alloy, stainless steel and the like, the stable production is difficult to realize due to the restriction of the plate shape control capability. According to known information, the thinnest rolling thickness of 0.006mm and the maximum width of 650mm can be achieved by mass production of pure copper foil, the minimum rolling thickness of 0.02mm and the maximum width of 600mm can be achieved by mass production of stainless steel foil, and the rolled plate shape is not good, which is mainly caused by the non-uniformity of the distribution of tension on the cross section of the foil. The wider the foil is, the greater the tension unevenness is, the more difficult the plate shape is to control, which is the bottleneck restricting the foil from developing in the direction of wider, thinner and more ideal plate shape at present, and is also a technical problem difficult to solve in the industry for a long time.

At present, the rolling of foil is realized by a multi-roller mill. Both domestic and foreign rolling mills have equal-diameter upper and lower working rolls, and both upper and lower half-roll systems of the rolling mill are symmetrically designed, from two-roll mills to twenty-roll mills. As shown in figure 1, the rolling mill in the figure is a six-roller rolling mill which is symmetrical up and down, a foil 3 is horizontally fed into a roll gap formed by an upper working roll 1 and a lower working roll 2 along a rolling central line 4 after being fed forward by a front adjusting roll 5, then is horizontally discharged along the rolling central line 4 after being fed backward by a rear adjusting roll 5, and therefore the uniform deformation of the cross section of the rolled material is realized. The design is beneficial to the stability of the central layer of the rolled material and the exchange of the rollers, but brings the disadvantages of more rollers, complex structure, high requirement on the installation precision of each roller and large workload of adjustment and maintenance, and the factors increase the operation cost of rolling.

In addition, the adjusting rollers 5 in front of and behind the machine are also designed with the same diameter, which is to simplify the structure and facilitate the exchange between the adjusting rollers 5. The adjusting roller 5 has the main function of flattening and the secondary function of oil blocking, the larger the roller diameter of the adjusting roller 5 is, the better the flattening function is, and the poorer the oil blocking function is; the smaller the roll diameter of the steering roll 5, the poorer the flattening effect, and the better the oil retaining effect. This is clearly a contradiction in the technical effect.

The size of working roll diameter is influential to the rolling of foil, the smaller the working roll diameter is, the more beneficial to the thinning of foil is, but the problem is also brought: as shown in fig. 2, the small diameter work rolls on the left side in the drawing have a small diameter and a small rigidity, and have a large biting angle into the foil 3, and a large lateral component force of the rolling force, and therefore have a large tendency to bend laterally. In addition, the length of the biting arc of the small-diameter working roll to the foil 3 is not favorable for the uniform introduction of a lubricating medium into a roll gap, so that the thickness of an oil film in a calendering arc area is not uniform. These factors cause a large fluctuation in the arc length of the rolling arc surface in the width direction of the foil 3, and eventually cause a defect in the rolled sheet shape. Under the same conditions, the large diameter work roll on the right side in the figure has a large diameter and a large rigidity, a small biting angle to the foil 3, and a small lateral component force of the rolling force, and therefore, has a small tendency to bend laterally. In addition, the biting arc length of the foil 3 by the large-diameter working roll is longer, so that a lubricating medium can be uniformly brought into a roll gap, and the thickness of an oil film in a calendering arc area is more uniform. These factors are all favorable for reducing the arc length fluctuation of the rolling arc surface along the width direction of the foil 3, thereby obtaining better rolling plate shape. In conclusion, the small-diameter working roll is beneficial to rolling and thinning, but is limited by the fact that the rolled plate shape is difficult to control, so that the rolled width is not suitable to be too large; the large-diameter working roll is beneficial to controlling the rolled plate shape, is suitable for rolling width, but is not suitable for rolling thin. For wide-width foil with thickness less than 0.15mm, the diameter of the working roll must be small enough (usually 25-100mm in diameter) to obtain a large reduction amount, and the shape of the working roll is very difficult to control, which is also the bottleneck restricting the rolling of high-precision wide-width foil.

The three basic conditions for stable rolling of the rolling mill are the roller system precision, the lubrication condition and the tension precision respectively. From the above, the multi-roll system framework of the current rolling mill affects the precision of the roll system, the constant diameter working roll and the constant diameter adjusting roll of the current rolling mill affect the lubrication condition, and the current rolling mill affects the tension precision of the foil, which are technical bottlenecks that currently restrict the foil rolling to develop towards the high-precision width direction.

Disclosure of Invention

In order to overcome the defects in the background art, the invention discloses rolling equipment and a rolling method, and aims to provide the following rolling equipment and the rolling method: solves or improves the problems in the background technology and breaks the technical bottleneck restricting the rolling of high-precision wide-width foils.

In order to achieve the purpose, the invention adopts the following technical scheme:

a rolling device for rolling foil is characterized in that: comprises a rolling mill and an adjusting roller group;

the rollers of the rolling mill are divided into an upper half roller system and a lower half roller system by taking a rolling center line as a boundary, wherein the number of the rollers of the half roller system is less than that of the rollers of the other half roller system, and the roller diameter of the working rollers is larger than that of the working rollers of the other half roller system;

the adjusting roller group comprises an expansion roller and at least one oil blocking roller, the expansion roller and the oil blocking roller are arranged on the same side of the roll gap of the rolling mill, and the roller diameter of the expansion roller close to the roll gap of the rolling mill is larger than that of the oil blocking roller far away from the roll gap of the rolling mill.

According to the technical scheme, the adjusting roller sets are divided into two groups and are respectively arranged on the inlet side and the outlet side of the rolling mill.

The technical scheme is further improved, and the foil is coated on the roll surface of the working roll with larger roll diameter by adjusting the heights of the flattening rolls on the inlet side and the outlet side of the rolling mill, so that an inlet side coating arc and an outlet side coating arc are formed.

The technical proposal is further improved, the wrapping angle of the inlet side wrapping arc and the outlet side wrapping arc is alpha, and the alpha is more than 0 degree and less than or equal to 60 degrees

The technical scheme is further improved, the roll diameter of the large-roll-diameter working roll is 1.5-5 times that of the small-roll-diameter working roll; the roll diameter of the flattening roll is 1.5-3.5 times of that of the oil baffle roll.

The technical scheme is further improved, the number of the rollers is reduced to half, the number of the rollers is three, and the three rollers are arranged in a straight line or in a triangular shape.

The technical scheme is further improved, the number of the rollers is reduced to half of that of the rollers, and the rollers are four and arranged in a T shape.

The technical scheme is further improved, the number of the rollers is half that of the rollers, and the rollers are six or ten and arranged in a fan shape.

A rolling method is characterized in that: by using the rolling equipment, the foil is coated on the roll surface of the working roll with larger roll diameter by adjusting the height of the flattening roll to form a coating arc.

According to the technical scheme, in a rolling deformation area of the foil, when the outflow speed of the plate surface on one side of the small-roll-diameter working roll is larger than that of the plate surface on one side of the large-roll-diameter working roll, the roll surface linear speed of the large-roll-diameter working roll is increased or reduced, so that the outflow speed of the plate surface on one side of the small-roll-diameter working roll is equal to that of the plate surface on one side of the large-roll-diameter working roll.

Due to the adoption of the technical scheme, compared with the background technology, the invention has the following beneficial effects:

the invention ensures that the foil forms a coating arc on the working roller with larger roller diameter, the tension is uniformly distributed on the cross sections of the inlet side coating arc and the outlet side coating arc by the back support of the working roller to the foil, the defects of wave, wrinkle and the like are eliminated at the early stage of the key forming of rolling, the plate shape is stabilized at the later stage of the rolling forming, the uniform rolling of the foil is realized, the bottleneck of restricting the development of the foil in the wider, thinner and more ideal plate shape direction is broken through, the technical problem which is difficult to solve for a long time in the industry is solved, and the invention has great application value and economic value.

The rolling mill adopts the rolling scheme of the unequal-diameter working rolls, improves the rolling lubrication condition, is beneficial to the thinning of foil and obtaining better plate shape, and has the technical effect which cannot be achieved by the existing equal-diameter working rolls. Although the invention sacrifices a part of reduction amount of the foil and slightly increases the rolling pass (the times of reciprocating rolling), the invention importantly keeps the plate shape stable and avoids or reduces the rolling defect caused by the increase of the width, which has great significance for the high-precision rolling of the wide foil. The invention is undoubtedly a breakthrough in the technology for rolling high-precision wide-width foils which have long been trapped in the technical bottleneck.

The rolling mill adopts an asymmetric structure of the upper and lower roll systems, the upper and lower roll systems respectively increase the rigidity of the upper and lower working rolls through the arrangement mode of single and double bus supports, simultaneously the stability of at least one working roll is increased, and the roll bending action of the other working roll is not hindered by the working roll bending action. On the premise of ensuring the same rigidity, the invention reduces the number of the rollers, simplifies the installation structure of the rollers on the rolling mill, is beneficial to improving the accuracy of the roller system and is convenient for the adjustment and maintenance of the rollers.

The unequal-diameter adjusting roller group has both flattening function and oil blocking function, and the oil blocking roller with smaller roller diameter has good oil blocking effect, is beneficial to squeezing off redundant lubricating oil and improves the production efficiency; the flattening roller with the larger roller diameter has good effect of flattening the foil, can reduce the original defects of the foil, enables the foil to enter a roller gap in a flattened state, and provides good basic conditions for rolling.

Drawings

Fig. 1 is a schematic structural view of a conventional rolling mill.

FIG. 2 is a schematic diagram showing a comparison of large and small diameter work rolls during rolling.

Fig. 3 is a schematic structural view of the invention in embodiment 1.

Fig. 4 is a graph comparing the effect of large and small diameter work rolls on oil layer extrusion.

FIG. 5 is a force analysis graph of a volume element on a clad arc.

FIG. 6 is a force analysis plot of a volume of cells with foil in an unsupported state.

Fig. 7 is a force analysis diagram of a volume unit with the foil in a backed state.

FIG. 8 is a graph showing the flow velocity distribution of the upper and lower layers of the foil in the calendering zone.

Fig. 9 is a tension distribution diagram in the thickness direction of a certain volume unit on the inlet-side clad arc.

Fig. 10 is a schematic structural view of the invention in embodiment 2.

Fig. 11 is a schematic structural view of the invention in embodiment 3.

FIG. 12 is a schematic structural view of the present invention in example 4.

Fig. 13 is a schematic structural view of the invention in embodiment 5.

Fig. 14 is a schematic structural view of the invention in embodiment 6.

In the figure: 1. an upper work roll; 2. a lower working roll; 3. a foil material; 4. rolling a central line; 5. a leveling roller; 6. flattening rollers; 7. an oil baffle roller; 8. an oil layer; 9. a volume unit; 10. upwards obliquely pressing a supporting roller; 11. downward direct-pressing supporting rollers; 12. and (5) downward obliquely pressing the supporting roller.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Example 1:

a rolling device is used for high-precision rolling of copper foil with the thickness of 0.1mm and the width of 1000 mm. The rolling apparatus includes a mill and a set of adjustment rolls, as described in detail below.

As shown in fig. 3, the rolling mill used is a nine-roll rolling mill, and the rolls of the rolling mill are divided into an upper half roll system and a lower half roll system by taking a rolling center line 4 as a boundary, wherein the lower half roll system is composed of a lower working roll 2 and two lower inclined pressing support rolls 12, the lower inclined pressing support rolls 12 are used for pressing against the lower working roll 2, and the roll diameter of the lower inclined pressing support rolls 12 is larger than that of the lower working roll 2. The upper half roller system is composed of an upper working roller 1 and five upper inclined pressure supporting rollers 10. The roll diameter of the upper working roll 1 in the upper half roll system is 100mm, the roll diameter of the lower working roll 1 in the lower half roll system is 200mm, and the roll diameter of the lower working roll 2 is 2 times of the roll diameter of the upper working roll 1.

In fig. 3, the two maximum upper obliquely pressed support rollers 10 with the roller diameters on both sides of the upper half roller system are drive rollers (the arrow lines in the figure are solid lines, and the same applies below), and the remaining upper obliquely pressed support rollers 10 and the upper work roller 1 are driven rollers (the arrow lines in the figure are broken lines, and the same applies below). Two lower inclined pressure supporting rollers 12 positioned in the lower half roller system are driving rollers, and the lower working roller 2 is a driven roller. The design is beneficial to the layout of the transmission mechanism and solves the problem of insufficient rigidity when the working roll is used as the driving roll. In order to ensure the stability of the deformed central layer of the material and prevent the upper plate surface and the lower plate surface from curling due to the difference of the rolling linear speeds, the rolling linear speeds of the roller surfaces of the upper working roller 1 and the lower working roller 2 are basically the same when rolling. The driving rolls in the upper and lower roll systems have different rotation speeds because the roll diameters of the driving rolls in the upper and lower roll systems are different. With the development of motor control, the variable frequency motor adopting a frequency converter can realize the adjustment of the rotating speed, and the servo motor adopting a driver realizes the high power, so that the variable frequency motor or the servo motor can respectively apply different rotating speeds to the driving rolls in the upper and lower roll systems, so that the roll surfaces of the upper working roll 1 and the lower working roll 2 have the same linear speed.

As can be seen from fig. 3, the lower half roll system has three rolls, two lower inclined pressing support rolls 12 and the lower working roll 2 are arranged in a triangular manner, and the two lower inclined pressing support rolls 12 form a double-bus support for the lower working roll 2, which has much better stability than the single-bus support in fig. 1. The roll diameter of the two lower inclined pressing support rolls 12 is larger than that of the lower working roll 2, and the roll diameter of the lower working roll 2 is twice larger than that of the upper working roll 1, so that the layout of the lower half roll system is beneficial to increasing the roll diameter of the lower inclined pressing support rolls 12 although the lower half roll system only has three rolls, and the integral rigidity of the lower half roll system is still enough. The upper half roll system has six rolls including an upper work roll and five upper inclined pressure support rolls 10. The five upper inclined pressing supporting rollers 10 are divided into an inner layer and an outer layer, and the roller diameters of the two upper inclined pressing supporting rollers 10 on the inner layer are larger than that of the upper working roller 1, but smaller than those of the three upper inclined pressing supporting rollers 10 on the outer layer. Since the roll diameter of the upper working roll 1 is the smallest, the roll diameter of the two upper diagonal support rolls 10 on the inner layer cannot be made large, and therefore the three upper diagonal support rolls 10 on the outer layer need to be arranged to increase the overall rigidity. The six rollers of the upper half roller system are integrally arranged in a fan-shaped stacking manner, the two upper inclined pressing supporting rollers 10 positioned on the inner layer form double-bus support for the upper working roller 1, and the three upper inclined pressing supporting rollers 10 positioned on the outer layer form double-bus support for the two upper inclined pressing supporting rollers 10 positioned on the inner layer, so that the stability and rigidity of the upper half roller system are also large enough and are equivalent to the rigidity of the lower half roller system. The asymmetric structure of the upper roller system and the lower roller system has the advantages that on the premise that the same rigidity and stability are guaranteed, the number of rollers of the lower half roller system is reduced, the mounting structure of the rollers on a rolling mill is simplified, and the rollers are convenient to adjust and maintain.

The adjusting roller sets are two groups and are respectively arranged on the inlet side and the outlet side of the rolling mill. The adjusting roller sets on the inlet side and the outlet side respectively comprise a flattening roller 6 and an oil blocking roller 7, the flattening roller 6 and the oil blocking roller 7 are arranged on the same side relative to the roll gap of the rolling mill, wherein the roller diameter of the flattening roller 6 close to the roll gap of the rolling mill is larger than the roller diameter of the oil blocking roller 7 far away from the roll gap of the rolling mill.

As shown in fig. 4, the wrap angles of the foil are equal for the small diameter work roll and the large diameter work roll. As can be compared from the figure, the extrusion angle α of the small diameter work roll to the oil layer 8 located at the upper portion in the figure is large, and in the same case, the extrusion angle β of the large diameter work roll to the oil layer 8 located at the lower portion in the figure is small. The smaller the extrusion angle, the more likely an oil wedge effect occurs, floating the foil from the roll surface, and allowing the lubricant to enter the other side of the roll surface. Therefore, the smaller the roll diameter of the oil blocking roller 7, the larger the extrusion angle of the lubricating oil, the more difficult the oil wedge effect is to be generated, the better the oil blocking effect is, the more redundant lubricating oil can be squeezed, unnecessary oil consumption and oil pollution of the working environment can be reduced, the running speed of the rolling mill unit can be improved, and the production efficiency can be improved. It can also be known that the foil coated on the small-diameter work roll under the same wrap angle has small arc length and large curvature, which is not beneficial to flattening the foil. The foil coated on the large-diameter working roller has long arc and small curvature, and is beneficial to flattening the foil. It is deduced from this that, in fig. 3, the unequal-diameter adjusting roller set takes the flattening function and the oil blocking function into account, and the oil blocking roller 7 with a smaller roller diameter has a good oil blocking effect, so that the oil blocking roller is beneficial to squeezing out redundant lubricating oil and provides a good oil film condition for rolling; the flattening roller 6 with the larger roller diameter has good effect of flattening the foil, can reduce the defects of wave, wrinkle and the like of the foil originally, and enables the foil to enter a roller gap in a flattened state.

In order to roll the foil uniformly, the invention provides a rolling method, which is characterized in that the foil is coated on the roll surface of a lower working roll by adjusting the heights of the flattening rolls 6 at the two sides of the roll gap of the rolling mill to form an inlet side coating arc and an outlet side coating arc, as shown in figure 3. In the rolling process, the back support of an inlet side coating arc and an outlet side coating arc is faced by the rollers of the lower working roller 2, and the front tension and the rear tension are uniformly distributed on the cross section of the foil, and the principle is as follows:

as shown in fig. 5, during the rolling process, the foil 3 enters the roll gap from the left side, the neutral point P is in the rolling arc, and the linear velocity of the working roll surface is greater than the linear velocity of the foil 3 entering the roll gap at the left side of the neutral point P, which generates a velocity difference and a friction force F3, i.e. the lower working roll 2 drives the foil 3 to rotate along the inlet side coating arc, just like a belt drive. In the figure, a volume unit 9 is arbitrarily taken on the inlet side coating arc, and due to the friction force F3, the proximal tension F2 acting on the volume unit 9 is smaller than the distal tension F1 thereof, wherein the proximal tension and the distal tension are expressed relative to the distance from the roll gap. For the next volume element 9 to the right of this volume element 9, the magnitude of the distal tension acting on this volume element 9 is equal to F2, while the magnitude of the proximal tension is smaller than F2, and so on, due to the cumulative increase of the friction force F3. It follows that the friction force F3 increases cumulatively from point a (the start of the inlet-side cladding arc) to point B (the end of the inlet-side cladding arc), and correspondingly the proximal tension F2 to which the foil 3 is subjected on the volume element 9 decreases progressively from point a to point B.

As shown in fig. 6, in the figure, one volume element 9 is provided on the foil 3, and due to the non-uniformity of the tension, the tension of the two side portions of the volume elements 9C and D is greater than the tension of the middle portion E, and the portion E bulges to form a wave. In the case of suspended tensioning of the foil 3, the proximal tension F2 is equal to the distal tension F1, and the volume element 9 is now retracted inward in the width direction, with a negative internal force F4.

As shown in fig. 7, when the volume unit 9 enters the inlet-side cladding arc, the lower work roll 2 applies a back-supporting force T thereto, so that the volume unit 9 is bent and deformed. The internal force F4 acting in the width direction of the volume element 9 is gradually increased from negative to positive due to the gradual decrease of the proximal tension F2. The increase of the internal force F4 causes the volume elements 9 to spread outward in the width direction as if the loose rubber band were widened in the width direction, thereby flattening the corrugated portion of the foil 3. In the flattening process, the near-end tension acting on the two side parts of the volume unit 9C and D is rapidly reduced, the two side parts of the volume unit C and D extend outwards along the width direction, so that the middle part E is in contact with the roller surface of the lower working roller 2, and after the part E is in contact with the lower working roller 2, the near-end tension of the middle part of the volume unit 9 is correspondingly increased, and further the uniform distribution of the near-end tension F2 on the cross section of the volume unit 9 is realized. As can be seen from fig. 6, the near-end tension F2 in the rolled gap region is the front tension of rolling, where the front tension is the smallest and the front tension is the most uniform in the cross section. It can also be seen that the larger the wrap angle of the inlet side wrap arc, the smaller the front tension in the nip rolling zone, and the more evenly the front tension is distributed.

In rolling, a larger front tension facilitates control of the shape of the strip. The presence of the entry-side wrapping arc, although distributing the front tension evenly over the cross section of the foil 3, loses part of it, thus requiring the coiler or the flattening roll 6 to add an appropriate front tension to the foil 3 to compensate for the loss. During rolling, the tension of the front end of the coating arc at the inlet side can be increased to 50-60% of the yield strength of the material, and the foil is thinned by fully utilizing the thinning effect of the tension on the foil. For the rolling of the foil, the rolling process is basically seamless rolling, the rolling process of the foil 3 by the working rolls can be regarded as a repeated thinning and widening process of the foil 3, and the coiling machine and the flattening roll 6 can be regarded as a repeated lengthening and narrowing process of the foil, so that the foil can be thinned and controlled in shape by properly increasing the front tension of the foil.

As shown in fig. 8, when the foil 3 enters the rolling area of the roll gap, the foil 3 starts to deform due to the extrusion of the working rolls, because of the existence of the inlet side coating arc, the deformation amount of the upper layer of the foil 3 is greater than that of the lower layer, the linear velocity of the mass point of the upper layer at the neutral point P is consistent with that of the roll surface of the upper working roll 1, while the plate surface of the lower layer lags behind, the linear velocity of the mass point at the E point is consistent with that of the roll surface of the lower working roll 2, so that the outflow speed of the upper layer of the foil 3 is greater than that of the lower layer of the foil 3, and under the condition of no post-tension, the foil 5 curls towards one side of the lower working roll 2, which indicates that the rolling area has the phenomenon of layer shift. The layer shift phenomenon deflects the neutral plane of the foil 3 to the lower layer and causes curling deformation of the foil 3. The curling deformation is obvious on the foil with larger plate thickness, but is not obvious on the foil with the thickness less than 0.15mm, and can be corrected through the subsequent procedures of flattening, straightening and the like.

For foils with high requirements, no curling deformation is allowed, so that the problem can be solved by changing the rotating speed of the working roller. In the rolling deformation area of the foil, when the outflow speed of the plate surface on one side of the upper working roll 1 is greater than that of the plate surface on one side of the lower working roll 2, the linear speed of the roller surface of the lower working roll 2 can be increased, or the linear speed of the roller surface of the upper working roll 1 is reduced, so that the outflow speed of the plate surface on one side of the upper working roll is equal to that of the plate surface on one side of the lower working roll, and the occurrence of curling deformation can be eliminated.

As shown in fig. 9, the strip foil 5 flowing out from the nip is wrapped around the lower work roll 2 to form an exit-side wrapping arc. Because the linear velocity V of the outgoing tape foil 5 is greater than the linear velocity of the roll surface of the lower working roll 2, the lower working roll 2 generates a reverse friction force F4 to any volume unit 9 on the wrapping arc at the outlet side, and a near-end tension force F5 and a far-end tension force F6 are also acted on the volume unit 9. In the exit-side coating arc, the frictional force F4 gradually increases from point M to point N, and likewise, the distal tension F6 increases accordingly. The distal tension F6 reaches a maximum at point N, where the distal tension F6 is the posterior tension. The post-tension not only prevents the deviation of the strip foil 5, but also contributes to the high-speed rolling of the strip foil 5. It is particularly important that the strip 5 is subjected to a gradually increasing back tension after it has exited the nip, which back tension is the smallest at the exit of the nip and the distribution of the back tension is the most uniform across the cross-section, which is important for controlling the shape of the strip 5. Only if the tension is uniformly distributed on the cross section of the strip foil, the defects of wave, wrinkle and the like of the plate shape can be prevented, but the invention realizes the uniform distribution of the tension at the roll gap outlet by coating the strip foil 5 on the roll surface of the lower working roll 2, and the defects of wave, wrinkle and the like are eliminated at the initial forming stage of strip foil rolling, thereby obtaining the better plate shape. With the continuous outflow of the volume units 9, the far-end tension F6 acting on the cross sections of the volume units 9 is gradually increased, the uneven tension trend starts to be obvious, but the strip foil 5 is not suspended and shaken any more due to the back supporting effect of the lower working roll 2 on the strip foil 5, the strip shape is stabilized in the key forming period of the strip foil rolling, and the defects of waves, wrinkles and the like caused by uneven tension of the strip shape are further prevented.

As can be seen from fig. 5, 8 and 9, the upper work roll 1 has a small roll diameter, a short rolling arc and a large pressing amount into the foil 3, which is beneficial to the thinning of the foil 3 and can reduce the total number of rolling passes. However, the rigidity of the upper working roll 1 is low, the lateral bending tendency is high, and the lubricating medium is not favorably and uniformly brought into a roll gap, so that the defect of plate shape of the upper plate surface of the foil 3 is caused. The lower working roll 2 has high rigidity, small lateral bending tendency and long calendering arc, and is beneficial to the uniform introduction of a lubricating medium into a roll gap, so that the lower plate surface of the foil 3 obtains a better plate shape. However, the roll diameter of the lower working roll 2 is large, and the amount of pressing into the foil 3 is small, which is not favorable for thinning the foil 3. It can be seen that the present invention combines the advantages of large diameter work rolls and small diameter work rolls: compared with the traditional working roll with the same diameter as the upper working roll 1, the increase of the roll diameter of the lower working roll 2 is beneficial to obtaining better plate shape; compared with the traditional working roll with the same diameter as the lower working roll 2, the reduction of the roll diameter of the upper working roll 1 has large pressing amount to the foil 3, thereby being beneficial to the rolling of the foil 3. Accordingly, the present invention also focuses on the disadvantages of large and small diameter work rolls: compared with the traditional working roll with the same diameter as the upper working roll 1, the increase of the roll diameter of the lower working roll 2 is not beneficial to the thinning of the foil 3. The reduction of the diameter of the upper work roll 1 is detrimental to obtaining a better profile shape, compared to the conventional work roll having the same diameter as the lower work roll 2. It should be noted that the lower plate surface of the foil 3 rolled by the lower working roll 2 has a good plate shape, while the upper plate surface of the foil 3 rolled by the upper working roll 1 has a poor plate shape, but the lower plate surface with a good plate shape plays a role in restraining the upper plate surface, thereby being beneficial to the stability of the plate shape as a whole.

For rolling foil with the thickness of below 0.15mm, the rolling is basically performed by negative roll gap rolling, and the thinning is very difficult, which is a main problem to be solved. In the embodiment, the foil is thinned by adopting the upper working roll 1 with the small diameter, and the lubricating condition of rolling is improved by adopting the lower working roll 2 with the large diameter, so that the foil obtains a better plate shape, and the requirements on the thinning effect and the plate shape of the foil are met. The problem of poor rigidity caused by the reduced diameter of the upper working roll 1 is a secondary problem and can be solved by increasing rigidity by abutting against five upper inclined supporting rolls 10. Therefore, in general, the rolling scheme of the unequal-diameter working rolls is beneficial to the defects, and although a small part of thinning amount is sacrificed, the foil is generally beneficial to thinning, and better plate shape is also beneficial to obtaining, which is a technical effect which cannot be achieved by the existing equal-diameter working rolls and is particularly important for high-precision rolling of wide and thin foils.

Example 2:

this example is different from example 1 in that it is used for rolling a copper foil having a thickness of 0.03mm and a width of 800 mm. Since the copper foil is reduced in thickness, it is necessary to use an upper work roll having a smaller roll diameter. In the embodiment, the roll diameter of the upper working roll 1 in the upper half roll system is 60mm, the structure of the lower half roll system is unchanged, the roll diameter of the lower working roll 2 in the lower half roll system is still 200mm, and the roll diameter of the lower working roll 2 is about 3.3 times of the roll diameter of the upper working roll 1.

In order to compensate for the insufficient rigidity caused by the reduction of the roll diameter of the upper working roll 1, as shown in fig. 10, the rolling mill is a thirteen-roll rolling mill, the framework of the lower half roll system of the rolling mill is not changed, the upper half roll system is provided with nine upper inclined pressing supporting rolls 10 which are stacked and arranged in a fan shape, the nine upper inclined pressing supporting rolls 10 are divided into three layers, the inner layer is provided with two upper inclined pressing supporting rolls 10, the middle layer and the outer layer are respectively provided with three upper inclined pressing supporting rolls 10, and the roll diameter of each upper inclined pressing supporting roll 10 is increased from inside to outside. The two upper inclined-pressing supporting rollers 10 positioned on the inner layer form double-bus support for the upper working roller 1, the three upper inclined-pressing supporting rollers 10 positioned on the middle layer form double-bus support for the two upper inclined-pressing supporting rollers 10 positioned on the inner layer, and the three upper inclined-pressing supporting rollers 10 positioned on the outer layer form double-bus support for the three upper inclined-pressing supporting rollers 10 positioned on the middle layer. Therefore, the stability and rigidity of the upper half-roll system are also sufficiently large, and are equivalent to the rigidity of the lower half-roll system. Compared with the embodiment 1, the roll diameter ratio of the lower working roll 2 to the upper working roll 1 in the embodiment is increased, the upper working roll 1 is more favorable for thinning the foil, the lower working roll 2 is more favorable for keeping the stability of the shape of the plate, and the implementation effect is better than that of the embodiment 1.

In the embodiments 1 and 2, the upper and lower working rolls are supported by double generatrices, so that the stability is good, and correspondingly, the roll bending effect of the working rolls is deteriorated. There is therefore a continuing need for improved solutions.

Example 3:

in the present embodiment, the rolling mill is a nine-roll mill. As shown in fig. 11, the upper half roll system of the rolling mill is the same as that of the embodiment 1, the number of rolls of the lower half roll system is three, and the roll diameter of the lower work roll 2 is 2 times that of the upper work roll 1. Different from the embodiment 1, the lower half roll system is composed of a lower working roll 2, a lower straight-pressing support roll 11 with a small roll diameter and a lower straight-pressing support roll 11 with a large roll diameter which are arranged in a straight line, wherein the lower straight-pressing support roll 11 with the small roll diameter is used for pressing against the lower working roll 2, and the lower straight-pressing support roll 11 with the large roll diameter is used for pressing against the lower straight-pressing support roll 11 with the small roll diameter. The spreader roll 6 can be brought closer to the work rolls because the frame of the lower half roll system relaxes the angular restriction of the foil entering or exiting the roll gap. In order to improve the oil blocking capability, three oil blocking rollers 7 are respectively arranged on two sides of the roller gap.

The bending of the working roll is to solve the convexity problem of rolling the strip foil, so that the strip is flat and straight. The upper work roll 1 has a small roll diameter and poor rigidity, and it is rather difficult to control the bending of the upper work roll 1. The roll diameter of the lower working roll 2 is moderate, the rigidity is moderate, the lower working roll 2 is bent, and the projection reduction amount is easy to control. Two lower straight-pressing supporting rollers 11 with large and small roller diameters are used for increasing the rigidity of the lower working roller 2, but only the lower working roller 2 is supported by a single bus, and the roller bending action of the lower working roller 2 is not limited.

As can be seen from the above, the upper half roll system in this embodiment ensures the rigidity of the upper work roll 1, and the upper half roll system does not interfere with the roll bending action of the lower work roll 2 while ensuring equivalent rigidity.

Example 4:

based on the same principle as in example 3, the rolling mill in this example is a thirteen-roll rolling mill, and the upper half roll system has ten rolls and the lower half roll system has three rolls, as shown in fig. 12. As can be seen from the figure, the structure of the rolling mill is a combination of the structure of the upper half roll system in embodiment 2 and the structure of the lower half roll system in embodiment 3. The roll diameter of the lower working roll 2 is 3.5 times that of the upper working roll 1, compared with the embodiment 3, the upper working roll 1 is more beneficial to thinning the foil 3, and the lower working roll 2 is more beneficial to stabilizing the shape of the plate.

In the

embodiments

3 and 4, the lower straight-pressing support roller 11 with the large roller diameter at the lower end is supported by the lower straight-pressing support roller 11 with the small roller diameter in the middle through a single bus bar, and the lower straight-pressing support roller 11 with the small roller diameter in the middle has poor stability, so that the technical proposal needs to be improved continuously.

Example 5:

as shown in fig. 13, the rolling mill in this embodiment is a ten-roll rolling mill, the upper half roll train having six rolls and the lower half roll train having four rolls. As can be seen from the figure, the upper half roll system of the rolling mill is the same as that of example 1, and the roll diameter of the lower work roll 2 is still 2 times that of the upper work roll 1. The difference from the embodiment 1 is that the lower half roll system is composed of a lower working roll 2, a lower straight-pressing support roll 11 and two lower inclined-pressing support rolls 12. The lower straight-pressing supporting roller 11 is used for pressing against the lower working roller 2, and the two lower inclined-pressing supporting rollers 12 are used for pressing against the lower straight-pressing supporting roller 11. The roller diameter of the lower straight-pressing support roller 11 is larger than that of the lower working roller 2, and the roller diameter of the lower inclined-pressing support roller 12 is larger than that of the lower straight-pressing support roller 11. As can be seen from the figure, the two lower inclined-pressure support rollers 12 at the lower end play a role of double-bus support for the lower straight-pressure support roller 11 in the middle, so that the lower straight-pressure support roller 11 is stabilized, and the stability of the support for the lower working roller 2 is further ensured.

Example 6:

based on the same principle as in example 5, the rolling mill in this example is a fourteen-high rolling mill, and the upper half of the rolling mill has ten rolls and the lower half of the rolling mill has four rolls, as shown in fig. 14. As can be seen from the figure, the structure of the rolling mill can be regarded as a combination of the structure of the upper half roll system in embodiment 2 and the structure of the lower half roll system in embodiment 5. The roll diameter of the lower working roll 2 is 4 times that of the upper working roll 1, compared with the embodiment 5, the upper working roll 1 is more beneficial to thinning the foil 3, and the lower working roll 2 is more beneficial to stabilizing the shape of the plate.

The details of which are not described in the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A rolling equipment is used for rolling foil and is characterized in that: comprises a rolling mill and an adjusting roller group;

the rolling rolls of the rolling mill are divided into an upper half roll system and a lower half roll system by taking a rolling center line as a boundary, wherein the number of the rolling rolls of the half roll system is less than that of the other half roll system, and the roll diameter of the working roll in the half roll system is larger than that of the working roll in the other half roll system;

the adjusting roller set comprises an flattening roller and at least one oil retaining roller, the flattening roller and the oil retaining roller are arranged on the same side relative to the roll gap of the rolling mill, and the roller diameter of the flattening roller close to the roll gap of the rolling mill is larger than that of the oil retaining roller far away from the roll gap of the rolling mill;

the two groups of adjusting roller sets are respectively arranged at the inlet side and the outlet side of the rolling mill, and foil is coated on the roll surface of the working roll with larger roll diameter by adjusting the heights of the flattening rolls at the inlet side and the outlet side of the rolling mill to form an inlet side coating arc and an outlet side coating arc.

2. A rolling mill as claimed in claim 1, characterized in that: the wrapping angle of the inlet side wrapping arc and the outlet side wrapping arc is alpha, and alpha is more than 0 degree and less than or equal to 60 degrees.

3. A rolling mill according to claim 1, characterized in that: the roll diameter of the large-roll-diameter working roll is 1.5-5 times that of the small-roll-diameter working roll; the roll diameter of the flattening roll is 1.5-3.5 times of that of the oil baffle roll.

4. A rolling mill according to claim 1, characterized in that: the number of the rollers is three, and the three rollers are arranged in a straight line or a triangle.

5. A rolling mill as claimed in claim 1, characterized in that: the number of the rollers is four, and the four rollers are arranged in a T shape.

6. A rolling mill as claimed in claim 1, characterized in that: the number of the rollers is six or ten, and the rollers are arranged in a sector shape.

7. A rolling method using a rolling mill according to any one of claims 1 to 6, characterized in that: in the rolling deformation area of the foil, when the outflow speed of the plate surface on one side of the small-roll-diameter working roll is greater than that of the plate surface on one side of the large-roll-diameter working roll, the roll surface linear speed of the large-roll-diameter working roll is increased or reduced, so that the outflow speed of the plate surface on one side of the small-roll-diameter working roll is equal to that of the plate surface on one side of the large-roll-diameter working roll.